Intake manifold for internal combustion engines



July 28, 1931. G. R. WELCH 1,815,163

' INTAKE MANIFOLD FOR iNTERNAL COMBUSTION ENGINES Filed July 22, 1929 -ATTORNEY1$ INVENTOR Patented July 28, 193i GEORGE R. WELCH, OF DETROIT, MICHIGAN INTAKE IFOLD FOR INTERNAL COMBUSTION ENGINES Application filed July 22,

The invention relates to intake manifolds for internal combustion engines of that type in which provision is made for the heating of the mixture when the engine is operating under certain conditions, such for instance as in cold weather, and for cutting out or regulating the heat when operating under different conditions. It is the object of the present invention first to obtain a simplified construction; further, to obtain an instantaneous response when adjustment is made and further, to obtain various ad vantages as hereinafter set forth.

In the drawings:

Figure 1 is a plan View partly in hori zontal section showing a portion of the exhaust manifold and intake manifold of an internal combustion engine to which my improvement is applied; I

Figure 2 is a similar View showing the parts in a different position of adjustment.

Figure '3 is a vertical cross section on line 3 3 Of Figure 2.

As illustrated, A is an exhaust manifold offan internal combustion engine and His the intake manifold therefor which has a vertically extendingportion B and a horizontally extending portion B Centrally within the exhaust-manifold A is a chamber C preferably formed by an inward bending of a portion of the outer wall as indi-;

cated at D. The horizontalportion of the intake manifold B is also fashioned so as to have a portion opposite the central portion of the exhaust manifold A and provided with i an inwardly extending portion E which abuts against and forms a gas tight joint with the portion D. -Within this portion E is a hollow member F centrally, pivoted at G and adapted to be turned from a position as shown in Figure 1 where it forms a valve for a closing connection between the manifold B and the chamber G to a position at right angles thereto as shown: in Figure 2. This hollow member 7 F has an opening H on its lower side which in the position shown in Figure 2 registers with the verticalportion B of the intake conduit, cutting off direct communication between said portion and the horizontal por 1929. Serial No. 380,131.

dlrected against the hot wall D of the chamher 0 to more perfectly vaporize and commingle the liquid fuel with the air. On the other hand, when the member F is turned to the position shown in Figure l, the mixture passes from the portion B to the portion B of the manifold without contact with any heated surface and the fact that the member F is hollow forms a heat insulation between the chamber C and the intake manifold. I

One of the principal advantages of my improved construction over devices that have heretofore been used is that when the engine is running the wall D is always heated by the exhaust gases so that whenever the member F is turned into the position shown in Figure 2 the heating of the mixture will occur instantaneously. This is quite different in effect from the constructions where exhaust gases are deflected to surround a portion of the intake and which therefore require a time interval to heat up this portion before the mixture is heated. Another advantage is as before mentioned that the hollow member F forms a heat insulation for preventing conduction of heat from the chamber G into the manifold B. A still further advantage'is the simplicity of the construction which is one thatcan be manufactured at low cost.

What claim as my invention is:

l. The combination with an exhaust manifold ofan internal, combustion engine, of an outwardly opening chamber within said manifold having its walls heated by the exhaust gases, an intake manifold having apertured laterally extending branch portions registering with the opening in said chamber, and a vertical portion connecting said branch portions and a hollow member ro- V tatively mounted within said inlet manifold and in one position of adjustment cutting off communicationjbetween the same and said chamber, said member in another position of adjustment cutting oil direct communication between said vertical portion and branch portions of said inlet and directing the incoming mixture first into said chamber and then outward into said branch portions.

2. In an internal combustion engine, the

combination of an exhaust manifold having a wall thereof depressed inwardly to form an outwardly opening Chainsaws-inn the manifold, an intake manifold havinghorizontal branch port-ions and "a vertical par-- tion connecting thereto said branch portions being aperturedin' registration with the opening in said chamber and provided with a portion surrounding said aperture and connecting the said chamber and a hollow member rotatively secured Within said connection portion adapted in one position ofadjustment to close said aperture and cut off communication between said inlet manifold and chamber and in another position of ad'ustment to direct the incomin ases from the vertical portion of said inlet conduit into said chamber and thence out-ward into the branch portions.

3. In aninternal combustion engine, the

combination of angexhaust manifold having a wallthereoi depressed to "form a semicircular chamber, within the manifold and opening outward, an inlet manifold having a vertical portion, "laterally extending branch portions and an-inwardly extending portion at the juncture of said vertical and branch portions the latter portion registering with said chamber and connecting to said exhaust manifold, and ajhollow oblong member rotatively connected Wltlll-Il sai-d inwardly extending portionv adapted when arranged parallel to said exhaust manifold and branch portions of the inletmani-iold to cut off communication between the latter and said chamber and when adjusted at right angles to such position to cut oifdi'rect communication between said vertical ;;por-

'tions-and branch portions of the intake manifold and to direct the mixture tram the vertical portions into said chamber and thence outward into said branch portions.

In testimony whereof I affix my signature.

GEORGE R. XVELGH. 

